不相等（!=）

console.log(1 != 1);
// Expected output: false

console.log("hello" != "hello");
// Expected output: false

console.log("1" != 1);
// Expected output: false

console.log(0 != false);
// Expected output: false

x != y

x != y;

!(x == y);

3 != "3"; // false

3 !== "3"; // true

1 != 2; // true
"hello" != "hola"; // true

1 != 1; // false
"hello" != "hello"; // false

"1" != 1; // false
1 != "1"; // false
0 != false; // false
0 != null; // true
0 != undefined; // true
0 != !!null; // false，看看逻辑非运算符
0 != !!undefined; // false，看看逻辑非运算符
null != undefined; // false

const number1 = new Number(3);
const number2 = new Number(3);
number1 != 3; // false
number1 != number2; // true

const object1 = {
  key: "value",
};

const object2 = {
  key: "value",
};

console.log(object1 != object2); // true
console.log(object1 != object1); // false